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Fix for #4084 Use-after-free (heap) in the SFD_GetFontMetaData() function
Fix for #4086 NULL pointer dereference in the SFDGetSpiros() function
Fix for #4088 NULL pointer dereference in the SFD_AssignLookups() function
Add empty sf->fontname string if it isn't set, fixing #4089 #4090 and many
other potential issues (many downstream calls to strlen() on the value).
Closes #4084
Closes #4086
Closes #4088
Closes #4089
Closes #4090
Meta-note: That I am continually annoyed at the number of open FontForge issues does not imply this is not a waste of time.